CS4272-CZZR Cirrus Logic Inc, CS4272-CZZR Datasheet - Page 32

• Manufacturer Part Number: CS4272-CZZR
• Description: IC,Soundcard Circuits,TSSOP,28PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

5.4
5.4.1
The analog modulator samples the input at 6.144 MHz (MCLK=12.288 MHz). The digital filter will reject signals with-
in the stopband of the filter. However, there is no rejection for input signals which are (n
passband frequency, where n=0,1,2,... Refer to Figure 12 for a recommended analog input buffer that will attenuate
any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modulators. The use
of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since
these can degrade signal linearity. Figure 13 shows the full-scale analog input levels.
32
AIN+
AIN-
Analog Connections
Input Connections
10 µF
10 µF
10 kΩ
10 kΩ
0.01 µF
3.9 V
2.5 V
1.1 V
3.9 V
2.5 V
Figure 12. CS4272 Recommended Analog Input Buffer
1.1 V
Full-Scale Input Level= (AIN+) - (AIN-)= 5.6 Vpp
Figure 13. Full-Scale Analog Input
+
-
-
+
470 pF
470 pF
C0G
C0G
634 Ω
634 Ω
91 Ω
91 Ω
1 µF
2700 pF
C0G
0.1 µF
AIN+
AIN-
CS4272
×
AIN+
AIN-
VCOM
6.144 MHz) the digital
CS4272
CS4272
DS593F1